fixed initial npm file error

stripe_to_invoice/next.config.ts

@@ -1,7 +1,16 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  output: "standalone",
+  output: 'standalone',
+  experimental: {
+    turbo: {
+      rules: {
+        '*.css': {
+          loaders: ['postcss-loader'],
+        },
+      },
+    },
+  },
 };
 
 export default nextConfig;

stripe_to_invoice/postcss.config.mjs

@@ -2,6 +2,4 @@ const config = {
   plugins: {
     "@tailwindcss/postcss": {},
   },
-};
+};
-
-export default config;